<template>
  <div class="todo-footer" v-show="total">
    <label>
<!--      <input type="checkbox" :checked="isAll" @change="checkAll"/>-->
      <input type="checkbox" v-model="isAll" />
    </label>
    <span>
          <span>已完成{{doneTotal}}</span> / 全部{{total}}
        </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "MyFooter",
  props:['todos'],
  computed:{
    total(){
      return this.todos.length
    },
    doneTotal(){
      /* let i = 0
      this.todos.forEach((todo)=>{
        if(todo.done) i++
      })
      return i */
      /*
      * const x = this.todos.reduce((pre,current) =>{
      *   console.log('@',pre,current)
      *   return pre +(current.done ? 0:1)
      * },0)
      * }
      * */
      return this.todos.reduce((pre,todo) => pre + (todo.done ? 1 :0),0)
    },
    isAll:{
      get(){
        return this.doneTotal === this.total  && this.total >0
      },
      set(value){
        this.$emit('checkAllTodo',value)
      }
    }

  },
  methods: {
    // checkAll(e){
    //   /*  console.log(e.target.checked) */
    //   this.checkAllTodo(e.target.checked)
    // }
    clearAll(){
      this.$emit("clearAllTodo")
    }
  },
}
</script>

<style scoped>
  /*footer*/
  .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
  }

  .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
  }

  .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
  }

  .todo-footer button {
    float: right;
    margin-top: 5px;
  }

</style>